Universal polishing attachment



Filed March l5,4l946 2 Shqets-Sheet 1 Nov. 15,1949 w. D. WELLWOOD ETAL 2,437,996

UNIVERSAL POLISHING ATTACHMENT IN V EN TORS War/'6)? D- T/Va/4 w00d Wick; field S. Slade AT T RNEYS.

Nov. 15, 1949 w. D. vwr-:| woo-|: ET AL 2,487,996

UNIVERSAL POLISHING ATTACHMENT Filed March 15, 1946 I 2 Shgets-Sheet 2 d Wi /F'e/d 5. Slade ATTORNEYS.

Patented Nov. 15, 1949 Warren D. Wellwood and Winfield 'S. Slade,

- Taunton, Mass.- I

Application March,1 5, 194. c, ;se i 1y 654.6312;

1 This invention relates to a work holder adapted to. be attached to a polishing head for supporting the work to be acted upon bythe polishing wheel. The polishing of articles and the like which have curved surfaces is usually accomplished manually by the operator who holds the work against the polishing wheel with his hands, turning and moving the work relative to the wheel so as to follow the contour thereof. Skilled operators are required to perform such polishing operations and which method of polishing is at best a relatively slow process. V

An object of the invention is the provisionpf a work'holder adapted to bepositioned adjacent. a polishing head which :will" be so constructed that 1 is rotatably mounted and: a manually operable crank handle is provided for this purpose. The work holder may" include a chuck or the like to which the work may be attached. At a convenient location such as onthe arm, a handleis i provided for moving the" arm to and-from the polishing-wheel so as to followthe contourof the work and at the same time the work may be rotated by means of the handle previously described. -This work holder comprises several ale- 1 merits which are adjustably related one to the the work held thereby may be presented to the polishing wheel'at a favorable angle and rotated and moved to and from the wheel'so as to follow the particular contour of the work acted upon by the polishing wheel.

Another obj ect'of the invention is the provision of a work holder adapted to be positionedadja-cent a polishing head which will be universal in its adjustment that the same maybe manipu? Iated so as to be adapted to be employed for use in polishing surfaces having various contours.

Another object of the invention is the provision of a work holder of the character above described which can be manufactured at'a comparatively I low cost of production and which will be durable and satisfactory in use.

With these and other objects in view, the invention consists of certain novel features of construction, as will be more fullydescribed and particularly pointed out in the appended claims.

In the accompanying drawings:

Fig. 1 is a perspective view of awork holder embodying our invention;

Fig. 2 is a side elevational View of the work holder shown in Fig. 1;

Fig. 3 is a plan view thereof;

Fig. 4 is a sectional view through the work holder taken substantially along line 5*95 of Fig. 2;

Fig. 5 is a sectional view of Fig. 4; and

Fig. dis a sectional view taken along line ii -e6 of Fig. 1. g

In carrying out our invention; we provide a bracket which may be attached directly iii-position on a polishing head or which may be attached to a support conveniently located adjacent the polishing head. On the bracket there is swivelly mounted a shaft to which is adjustably mounted an arm carrying a work holder. The work holder taken along line other so'that various angular relations may he provided between the work and the wheel.

Referring-to the drawings for a more detailed description of the invention, l designates generally a Work holderhaving a. bracket designated generally it on which is swivelly mounted a shaft i2. The-braeketcomprisesa plate I3 from which there extends a post I4. The plate has oppositely disposed slots i for receiving bolts .16, .to. attach the plate directly tov the polishing head or to any convenient-support such as the support I! shown in Fig. 2. This supporthasa shank portion l8 which is received in an opening I!) in column and is thereadjustably secured in place by means of asc-rewli'. support I"! a fiat surface 22 against which the plate 13 abuts. It will be apparent that the height of-the holder may he. ads justed both by means of the adjustment provided inthe support l1. and by means of the. elongated slots 15 in the plate [3. 7 A bearing membernis provided with clamp portion. 24, havinganopening 25 in which is. slide ablyrecdivedthepost IA. Spaced ears 2.6 mm Eh which .extends screws 1, serve to .ad'ustbly cure. ,thebearing member to th y shaft [5.- The member is also provided with a bear n p rt on is constructed sim la to the clam po tion mi ha herein thr u whi. s. l a l or tat b yrecei ed the sha i Collars 3 re, nositioned on both sides of the portion28 and there secured to. the shalt so as. to

V prevent l te a mo em t betwee e be r n 2 a d e af 2;- This bearing 28 is split and rovided with spaced ears '32 through which a screw 33 extends to draw these cars 32 toward each other so as to ads just the frictional contact between the walls of the bore and the shaitiZ. It is apparentthat the shaft 12 may be adjustable. axially thereof by loosing the collar securing means and sliding the shaft. [2 in-thebore 30.

The end of the shaft I2 is provided with an enlargement 34 having an opening 35 extending therethrough. An arm 36 with a similar enlargement 31 is positioned in line with the enlarge- 3 ment 34 and is provided with an opening 38 extending therethrough and in line with the opening 35. A bolt 39 has a head portion 40 which engages the enlargement 31 and extends through these openings with the threaded end thereof extending beyond the enlargement 34. A nut 4| engages this threaded portion to draw the parts 34 and 31 toward each other into firm adjustable engagement so as to prevent relative movement therebetween. For convenience the nut is provided with an extension 42 having slotted opening 43 to receive the flat end portion 44 of a handle 45. A pin 46 pivotally mounts this handle 45 on the nut. It will be apparent that the handle 45 provides for an attached means to turn the nut in the desired direction.

The other end of the arm 36 has a cylindrical formation 41 which is provided with an opening 48 (see Fig. 2) extending therethrough providing a bearing opening for rotatably mounting a work holder designated generally This work holder comprises a sleeve 5! having a reduced portion 52 providing a shoulder 53. The reduced portion 52 is rotatably received within the opening 48 with the shoulder 53 abutting against one edge of the cylinder 41. The reduced portion 52 extends beyond the other end of the bearing and a collar 54 surrounds this sleeve and is secured thereto by a set screw 55 and abuts against the cylindrical portion 41 thereby preventing lateral play or the sleeve 51. The opposite end of the sleeve 51 is also reduced to provide an extension 56 the outer surface of which is threaded to receive a chuck 51.

This chuck is of cylindrical formation and may be made of various material but is herein shown as being of wood. One end of the chuck is bored and has a threaded nipple 58 secured therein such as by a casting operation and the opposite end is provided with a tapered cavity 59 which is intersected by radial slots 61] (see Fig. 5) extending inwardly from the periphery of the chuck. The forward end of the chuck has an annular recess 6i which is. of a size to receive the work W to be held in the chuck. While we have shown a recess til to engage the work, this of course maybe changed to conform to the nature of the work to be held thereby. The cavity 59 receives a tapered lug 62 having a threaded opening 63 in which is received a rod 64 extending through the sleeve 5| and through an opening 65 in the chuck 51. This rod extends beyond the reduced portion 52 and is provided with an enlargement 66 which abuts against the outer edge surface of the reduced portion 52. The tapered plug 52 is prevented from relative rotation by means of an extension 61 extending into one of the slots 60. The rotation of the rod 54 in one direction will draw the plug inwardly within the cavity and expand the slotted portions of the chuck body to firmly secure the work in position. Rotating of the rod in the opposite direction and moving the same forward will of course move the plug in an outward direction to permit contraction of the slotted portions of the chuck to permit removal of the work piece.

In order to rotate the work holder, a crank with handle 68 is provided. This handle 68 has an opening 69 in which is received the end of the 4 reduced portion 52 and is there secured by means of a set screw 10.

A handle H is swivelly mounted on arm 16. This handle is provided with a bent ortion 12 as best shown in Figs. 1 and 6, and is loosely mounted so that as turned it will move through an arc to accommodate the positioning of the arm of the operator of the device.

In the use of the work holder described, the bearing member 23 may be rotated about the post l4 so as to locate the axis of rotation of the work holder at approximately 10 degrees to the axis of rotation of the polishing wheel. This adjustment having been made, the same may be retained by means of the screws 21. This will provide a favorable angle or bias between the work relative to the polishing wheel. When all the proper adjustments have been made, the operator grasps the handle II with one hand and the handle 68 with the other hand. The arm is moved by the handle H to present the work to the surface of the polishing wheel. The handle 68 is turned so as to rotate the work at the proper speed. Should the contour of the work be such as to require movement in or out relative to the wheel the operator may do so by rocking the shaft 12 in the bore 28 which will move the work to or from the polishing wheel depending upon the direction in which the shaft is rocked.

We claim:

1. A work holding attachment for a polishing head comprising a plate for attaching to a polishing head and the like, a post extending from said plate, a bearing member carried by said post and adjustable axially and rotatively thereon, a, shaft rockably mounted in said bearing member, an arm carried by said shaft, a work holder rotatably mounted on said arm, manual operative means for rocking said shaft and arm carried thereby for presenting the work to the polishing wheel and means for rotating the work holder.

2. A work holding attachment for a polishing head comprising a plate for attaching to a polishing head and the like, a post extending from said plate, a bearing member carried by said post and adjustable axially and rotatively thereon, a shaft swivelling mounted in said bearing member, an arm carried by said shaft and pivotally adjustable thereon, a work holder rotatably mounted on said arm, manual operative means for swivelly moving said shaft and arm carried thereby for presenting the work to the polishing wheel and means for rotating the work holder.

3. A work holder attachment for a polishing head as set forth in claim 2 wherein the shaft is adjustable along an axis extending at substantially right angles to the axis of the post.

- WARREN D. WELLWOOD.

WINFIELD S. SLADE.

REFERENCES CITED 'The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 748,768 Melvin et a1. Jan. 5, 1904 937,379 Miller Oct. 19, 1909 1,366,962 Schwagel Feb. 1, 1921 1,600,367 Sczawinski Sept. 21, 1926 1,846,898 Packer Feb. 23, 1932 

